Tuning question, it's pinging

1039 Views 10 Replies 7 Participants Last post by Hottarod, Mar 30, 2001

Billgear

Discussion Starter · Mar 29, 2001

I have a modified 302 with AFR heads and performance cam. I'm running 12 degrees intitial with 32 total on
my timing. the car is about 9.8-1 compresion, and I run 92 octane gas. I intalled light springs in my distibutor to get my timing to come in quick (read that this was a good thing). My car will ping if a bog
it down like 2k in 5th gear and then floor it. It doesn't ping once the RPM's have gone over about 3K.
Do I need to install some heavier springs in my distributor advance to keep the timing from advancing so quick? I'm going to get it dyno tuned soon, I want to get it close to optimize my dyno time. Any idea's
would be appreciated. I'm not running any vacuum advance.

Regards,
BillGear

1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg
<P ID="edit"><FONT SIZE=-1>Edited by Billgear on 03/28/01 10:39 PM (server time).</FONT></P>

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66gt350

· #4 · Mar 29, 2001

You should be able to run on pump gas with that compression. I've got 10.5:1 in my 302 and I have no problems with 92 octane and 14 initial and 39 total. At what rpm are you getting the total advance? You might try and put in a little heavier spring.

I was having a similiar problem with my 351W, but I've got over 11.5 compression. I was talking with the folk at century performance and they said that running a stick shift I'm going to have a little pinging. They told me to keep the rpm up a little bit.

Rob
Member: Slightly Modified
66 coupe 302
66 fastback 351W

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